I'm not sure whether I paid a premium for the ring grain designation. I might have. Like @cigrmaster, however,It has to be fairly recent. Certainly didn't exist when I was smoking Dunhills and used to visit the Dunhill shop in Beverly Hills. People love titles. It makes the subject seem that much more special. The term ring grain has been around for many years without affiliation to any one marque.
I bought the pipe because of the classic billiard shape, which, to my eyes, is almost perfect.